Enhanced Surface Passivation of Colloidal CdSe Nanocrystals for Improved Efficiency of Nanocrystal/Polymer Hybrid Solar Cells

We report on a highly effective surface passivation ligand, i.e., thiophenol (TP), for cadmium selenide (CdSe) colloidal nanocrystals (NCs) to improve the performance of CdSe NCs:MEH-PPV hybrid solar cells (HSCs). Post-TP surface treatment of CdSe NCs produces enhanced surface passivation of the hig...

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Bibliographic Details
Published in:IEEE journal of photovoltaics 2016-09, Vol.6 (5), p.1203-1209
Main Authors: Jea-Young Choi, Inho Kim, Jabbour, Ghassan E.
Format: Article
Language:English
Subjects:
Cadmium compounds
Cadmium selenides
Colloidal nanocrystal (NC)
Devices
hybrid solar cell (HSC)
II-VI semiconductor materials
Intermetallics
Ligands
Nanocrystals
Optical surface waves
Passivation
Photovoltaic cells
Solar cells
surface defect
Surface morphology
surface passivation
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Summary:We report on a highly effective surface passivation ligand, i.e., thiophenol (TP), for cadmium selenide (CdSe) colloidal nanocrystals (NCs) to improve the performance of CdSe NCs:MEH-PPV hybrid solar cells (HSCs). Post-TP surface treatment of CdSe NCs produces enhanced surface passivation of the high density of NC surface states, resulting in greatly increased photocurrent generation from the NCs, and boosts the overall device performances. The power conversion efficiency of the HSCs with TP surface ligand is improved to 1.57% from 0.32% of a conventional ligand, i.e., pyridine, treated device made with only 10-mg/ml low concentration of NCs, which was blended with polymer at 1:6 (NC:polymer) ratio.
ISSN:2156-3381
2156-3403
DOI:10.1109/JPHOTOV.2016.2585024